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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2288f5977eb7f77ac06ddf265ad51a4cb6f59fd576828e75d8f2ec4db5d33c92' 
  AND token = 'bVFGugLtUK7eeY73sDyAVldyr8dab2YTOy2XTv3kJPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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