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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49949f7d41bd358b08acbd2f8ed34ae00c194fc7c07f490e014c33520b840d7' 
  AND token = '+5lFMtE6w8ehBmc61IUYxKWddN5U2XzP3w1nvpSTR2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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