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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b2170dd9ac62b0728bb3edd770941d02d740a0d31b0fd88f6580d8dfd7ee50' 
  AND token = 'd7L/04pkTGw+G94N9uHn7U22VcA1wCR1i1I95mJz1xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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