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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789286c1cf996a493dd8f63fd26f56d16be9ddf598b194a9bc8324db62b12bf7' 
  AND token = 'G1oeTbXYwDeiQpaNSSB5R3Y66Rru9LS6fo4cWrah2tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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