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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a318fcb297613ba0a1a707d5c2102608f0454ec885b6d718bab69b1b413c8ba' 
  AND token = 'HmpSMeqx3EZXDec/G8uPL1+2NKtnF5/fn98FbSGbmPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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