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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017ada2c42fda83208f4f3c333f7b80682ac19f6a02758d34d1380ab127dd453' 
  AND token = 'iRtGKo6A0Z5q9/ho9yResMdRbROi2dAVECkUx29DtTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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