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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5478d374af889cb3a7a649b0d318dac4287d84c037b23141a78560fc4e885d71' 
  AND token = 'h+vTEYzptIgFbTlULhqylxsyUAHNZyabd0BZbUAVlbY=' 
  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"
    }
  }
}