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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce658e8ecbaced3c58e9f6385b7d8b6e549648853605a5444091b5ae4d3e8413' 
  AND token = '9T0VFh1z8NRexIGexcCC6/4z41LNG27oE9kmB7XT8ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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