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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cfb2b6cd84825dabae1cb4075bc13033bb68af13e38d13fdecb4961f94fab9' 
  AND token = 'QN9KI6ucLVYGc/Gg1IfZzuqkndmjOYibKk3IoNbEKbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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