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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ecacfc35d26d443a085f904ac83df04d1596743308241178b2c7d62d7f8122' 
  AND token = '+MKMBdQpVqlAOio5L+bzUa4tvLzMHg1QDewy0ofEki0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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