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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8364c1e3b00bd2f45d7066334c8fe74f76c0dd366686219e3c4275696165f462' 
  AND token = 'nmOw2r1M2u6TBzvgLBB3sMoI+hdUFUo4BBbO0BBXdXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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