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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b9dd10d0c4c61ae7e80c3a7b63af60d74fbc6fb5b221f5210becf1693deebf' 
  AND token = 'TRnP1Pv6u5Zmph9hLE0TAC4DCYgRq8IKfTND67Cgf6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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