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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba144576c434556828c38fb1ae8d4788c24542334d21d24d38e81c3cfd17f03e' 
  AND token = 'wqrtmV3RrdOHl9RvCSd5tm6HgPTp4r1+CsJilKmGTKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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