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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d5199c2dd6d36a24be114cf149d3603a1a1c9e365b150829f77aaf1e2f9bdc' 
  AND token = 'LN/gpJ3/0MI1PA6zpvMb/CpSPE5gCBSBzDvnl9qP9aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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