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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96315a9fa77dd801730b63c5abe80e0cdc15a8281ea54c57d2053e5de5620fb' 
  AND token = 'dcSBtUaQIJy0GPO7X3VFHRbVW9X2hmVWGker1MUk5Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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