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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3f5d5641ace7a2419e6affca7bc44c5b3c77866e38b060e4b44e45bdc6850e' 
  AND token = 'mCKc5Oj4jHzIRfJKjvLtF4fWA06lFyjzlLCjtzxotms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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