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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d84228db0c2b1937635d89501619e3ebee03a81b93290a349577d22fcafcee' 
  AND token = '4d3Cgsv8WouyHlUembxKdFOP70GyPvzgbdkywIX56CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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