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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651d6c0120496697d1ee05586154b0e7e2803b7def9dfc1a26d8822287300d19' 
  AND token = '3ojvwEDkywtrWo99tiN7xiQmQE5N7/j4Fssm/i61TFw=' 
  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"
    }
  }
}