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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5317672ce30b0fcf4a0dd829e1dc4a6b8200a2a6a923dcb603dfb1d79486b0' 
  AND token = 'OKmBfmPx6D5+p+1MGxQM2K0/fDjNqKefYamvpo4DTOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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