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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06d78929ff0831349333fb0114008501dfeb3b5dc75fed79c1b2d309593030c' 
  AND token = 'W7ILR3GYYGMqIfZIt/XMqEX9N8iz1SU/EH4grgySEIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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