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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b81331614caaec0e463f14ef8c8a5e78871cc832aa330877761fd199d60d0a' 
  AND token = 'DRhw8k9WEKUD8rTYnD+OKQk4Fd22gu400mvcdP2HWtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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