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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67622b3a66d3da786928a9b9231868e247d44a7c065f233daec40fca751d4e92' 
  AND token = 'z0/tSgs4mJ3Rz+yn7cdY0KTGGYKeji9QFn4GS0FtR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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