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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7615de9e4974b0720a96777a076a6c4b442d52bf7b9ac3da6d3343ca11dddd0' 
  AND token = 'AGVU1r/FgIaIXHMx+Sr29XbDAJtlN/ikvHJl/SP/Y6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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