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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8aec225607d8aa35d4cd260d8edfaab188cf0959b00e78d83ed94c7e3094095' 
  AND token = 'iD1MLDXQvAzg7WOP8UvCQMkbWN7pHfJHlGxW7YRTkAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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