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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33893f334a1594ab9192e7ef10b39e6ff8a6c06fa82284850adf89e6b09f0e19' 
  AND token = 'IIZnkTykueI2r+mS6Aua4ufISJDjTN1Bx1eK43DuF74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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