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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e7c9d99841cc8a4756d2903616ace751319c9ba3eaf93d1a4022b95f8f09ec' 
  AND token = 'wwk2VMX2ll6gm+QHI4q3c55w4NtW8gJtUE1qVFEfViA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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