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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c457b8200cd8a03aeb42754c2504f2e8ffea6a6ba8bb53e21230776cfdc2e193' 
  AND token = '53G8ra1RTacxkX8mnIHfnu26eSRK0CSAKJeG6EQY3tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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