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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3b7e148fe23e346f8a5758647e97ea24aae8f8d14a3cac283c014263d25756' 
  AND token = 'rETfz4tZi3S5ET9J5v1Af7CxE/s+CMw+EKz3LHpMhqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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