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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147e58eb226b2e227117c527b7606e09be4fbe4790e5b6a2a7ab7fee5cea3ac8' 
  AND token = 'dWhln50+ziAsz80grt0s9SxL/Z6i2Gb4+gROrPT0wt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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