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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b50af38554f1b4880f0010c05b2d5268d442036d8649bd9750c9a5a650431cf' 
  AND token = 'NqAkJE7gu+8j+/tJwIt6bAzYNBxcJJLqX8My6P4hRLM=' 
  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"
    }
  }
}