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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc0b6677fdb0e68ca7a3a8c6be4d4b842b2fc6758cf033e338fa6b87c93623d' 
  AND token = 'YdfQ5L6VGXjsVo0I+E5a1w8pjfxgw0T74EUw3dtQB+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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