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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac0a056abd132be96d05bba40feeb7ae338cbf1fa07fae70058292b104c62a1' 
  AND token = '/POBHCj6dP5nee4MsM0ugBfMfqbcdCHeSUhfmmEN284=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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