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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5fa003632d9775683d2abd91cfa309084365242ba67a19f0554ac4ed8bb671' 
  AND token = 'FzvBoaQSGTu6hMRW0WiNcMd7q5Quja+WY4BWIFSkUzA=' 
  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"
    }
  }
}