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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c651297ac53ecff073f054c2cd58229478e6e3d0b15c87dd9b4435c6d9999cad' 
  AND token = 'GFRC9hvvQZz36TB8W6yxrL5n8vQEXMqORhEmQLo1xAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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