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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0da35228283b0ac938b318828635c4e7b2c28928e42640545c734cde78c81b' 
  AND token = '7joDHNVVAlq3v55tO73yiD6NajMtREG17mZth6fEnWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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