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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d870650c3280333f8536326848e991d30f2080857caf1c5baa62d5b1257bc44' 
  AND token = 'Yrxd13LiEFtCRqlp/mEwPZbYrylQ6bYO7Nu+p5rByfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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