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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a961f32b3c4e988a83229c4f9c3a7b55e8016205d56ecea2bee1c884aa1226' 
  AND token = 'V3f1GA7afY3xFbNk3/+DaZt0S0L4KilSHtSCrcaJbfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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