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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea0ca71aaa48006b774c3869a6c70e32d1bd1143b217a17d4cefae51bc1da8a' 
  AND token = 'Vl2AzQQOsyWlgnTMe/ArxC4txkhjKnLG2uoGBi60iJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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