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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de7c970e79c33a9609acaaa28b0e34c5a5b000954cdcb854f84b1fe4168f5a5' 
  AND token = 'kblUlRTiJQvEp1k7Kai60p3E5/g+0znPxxadHpo6xbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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