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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff73dcdcdc26dbae1836aa6255646f6a449e07c649f68b7d458f6a62856e66e' 
  AND token = 'Ek125Y/shU/ulbR5Z5AMJQfxRPbf0wNVDXBLApKS+0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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