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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9741e83880d27d4f96c259102ee1764d1cf09fe3a9a2ed5b8f4747ba7513ce9' 
  AND token = '58Tz+FvtwyET1qGL5kbkVU/1/anIyVlJxC1SD1UBAJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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