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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9584f5436b8c3372645d4820467c034ef6c22b85463348c0c340a0f60f216a' 
  AND token = 't/Y/4Hj6bRP7hg2eO5MOppYjFtBd+ZrJlfmnGiGONwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}