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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc975084867d2f8309ef00eccb4077a462638e53286ae8bb69289e75d3bb00a' 
  AND token = '5ZGuTz8gtJU8Ap65p8zLCv1FszHoWJbdCglz+j+Z9yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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