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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9f42019d197608efe841fe44ab9ba76f2c2d21782ced7c08d94cd45ead4d6d' 
  AND token = 'FkS5ftvvqoCnwzQonrSAriNLGN8LbjR9ydD8zdPU2mQ=' 
  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"
    }
  }
}