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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3516113a0648f5968caaeff91a91197e1ada5b954c6435d4157088e1eec9a4' 
  AND token = 'VUOt4F0VVP4u4LMq43uF7Rdf0gLslr7krpled9sHLpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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