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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81bfa7e81c4b480dd78ccea22d5a74cba123f0093431c55e5a8c129945693b6' 
  AND token = '5p5V2H29Yo3QG7dXxpBgg3WEnbA+Jf/n2RAsZH9+rPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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