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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc87b15bc2cb4b6a5108739080e21503dde2d0bea34c843c5c69d0de8c5ee37' 
  AND token = 'iy6VFkZErCY3z8gWT/WLCRolytmCzds/zHTzap0oIQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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