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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbf5c9bf93223bc32d5c950afcbd1d5fc6f312abe8dded207fdd5976f540dad' 
  AND token = 'ebfo1uL50huvaKpZVsc2OVJ3IeHSP0UqTsu2r/0XoEA=' 
  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"
    }
  }
}