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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2668a9304d780e3a64a8180299037bff44e5820e478e70084ca5229c785a566b' 
  AND token = 'MsM/m4XqadCXPkSN4SdF2r1zzO+cup+cEdkYBYWY07w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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