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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6f90df6d78e4f4cbebf4a47aff6a58cc5e72a699bf4ee1a8828e536d516eb2' 
  AND token = 'G0BE0+oI2+WCu3yv2EqtCW1AgQIRBZkApiyn+G7XJIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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